Chemical Process
Chrome tanning and vegetable tanning are done for

Light & heavy leather respectively
Both light & heavy leather
Heavy & light leather respectively
Neither light nor heavy leather

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Chemical Process
In the manufacture of H₂SO₄, vanadium catalyst as compared to platinum catalyst

Handles lower SO₂ content gas (7 -10% SO₂), thus increasing the capital cost of the plant
Gives higher conversion efficiency
Has a longer life and is not poisoned by arsenic
All of these

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